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| Ordering number : EN5764 Monolithic Linear IC LA7566 VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL and NTSC Multisound Support Overview The LA7566 is a VIF/SIF IC that supports PAL and NTSC multisound and that adopts a semi-adjustment-free system. To simplify adjustment, the VIF block adopts a technique in which AFT adjustment is no longer required by VCO adjustment. The SIF block supports audio multidetection by adopting a PLL detection technique. The SIF block provides 4 inputs with IC internal switching for easy design of multi-sound systems. Additionally, these switches can also be used for video system sound trap switching. The LA7566 also includes a buzz canceller that suppresses Nyquist buzz to achieve improved audio quality. Package Dimensions unit: mm 3067-DIP24S [LA7566] Functions Allowable power dissipation, Pd max -- W SANYO: DIP24S [VIF Block] * VIF amplifier * PLL detector * BNC * RF AGC * EQ amplifier * AFT * IF AGC * Buzz canceller [First SIF Block] * First SIF amplifier * First SIF detector * AGC [SIF Block] * Multiple input switch * Limiter amplifier * PLL FM detector Features * No coils are used in the AFT and SIF blocks, making these circuits adjustment free. * PAL / NTSC multisound system can be constructed easily. * Built-in buzz canceller for excellent audio performance Ambient temperature, Ta -- C Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Circuit voltage Symbol VCC max V7, V9, V10, V17 I1 Circuit current I13 I18 Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg Conditions Ratings 10 VCC -2 -3 -10 720 -20 to +70 -55 to +150 Unit V V mA mA mA mW C C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 31398HA (OT) No. 5764-1/11 LA7566 Operating Conditions at Ta = 25C Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCC op Conditions Ratings 9 4.6 to 9.5 Unit V V Operating Characteristics at Ta = 25C, VCC = 9 V, fp = 38.9 MHz Parameter [VIF Block] Circuit current Maximum RF AGC voltage Minimum RF AGC voltage Input sensitivity AGC range Maximum allowable input No-signal video output voltage Sync tip voltage Video output level Black noise threshold voltage Black noise clamp voltage Video signal-to-noise ratio C-S beat Frequency characteristics Differential gain Differential phase Maximum AFT voltage Minimum AFT voltage AFT detection sensitivity VIF input resistance VIF input capacitance APC pull-in range (U) APC pull-in range (L) AFT tolerance frequency 1 VCO 1 maximum variability range (U) VCO 1 maximum variability range (L) VCO control sensitivity [First SIF Block] Conversion gain 5.5 MHz output level Maximum first SIF input First SIF input resistance First SIF input capacitance [SIF Block] Limiting sensitivity FM detector output voltage AM rejection ratio Total harmonic distortion SIF S/N VIi(lim) VO(FM) AMR THD S/N (FM) 55 5.5 MHz 30 kHz 390 50 43 500 60 0.2 60 1.5 49 630 dBV mVrms dB % dB VG SO SIN max RIN(SIF) CIN(SIF) 33.4 MHz 33.4 MHz 32 84 85 35 87 88 2 3 38 90 91 dB mVrms mVrms k pF I3 V9H V9L VIN GR VIN max V13 V13 tip VO VBTH VBCL S/N IC-S fC DG DP V10H V10L Sf Ri Ci fPU fPL dfa1 dfu dfl B 1.15 -500 1.7 38.9 MHz 38.9 MHz 1.0 7.5 0 29 6 MHz S1 = OFF 28 45 95 3.7 1.3 1.7 0.7 2.0 48 44 -3 45 7.5 53 8.1 0 34 50 100 4.0 1.6 2.0 1.0 2.3 52 49 -1.5 3 3 8.5 0.2 37 1.5 3 1.5 -1.5 0 2.0 -2 2.3 -1 4.6 -0.8 +500 8 8 9.0 1.0 47 4.3 1.9 2.3 1.3 2.6 0.5 40 61 mA V V dBV dB dBV V V Vp-p V V dB dB dB % deg V V mV/kHz k pF MHz MHz kHz MHz MHz kHz/mV Symbol Conditions Ratings min typ max Unit [SIF Switch Block] Switches A, B, and C: H = open, L = ground NTSC mode 6-dB amplifier SIF crosstalk 21 SIF crosstalk 22 SIF crosstalk 23 SIF crosstalk 24 Switch threshold low-level voltage NTSW CT21 CT22 CT23 CT24 SW (L) 5 51 51 51 51 1.0 6 57 57 57 57 1.5 7 dB dB dB dB dB V No. 5764-2/11 LA7566 Pin Assignment Application Circuit Diagram A H H H H L L L L Switch B H H L L H L H L C H L H L H L L H 5.5 MHz q 6.0 MHz q 6.5 MHz 4.5 MHz q q q q q q q q q q q q q H : OPEN L : GND No. 5764-3/11 LA7566 Internal Equivalent Circuit Diagram No. 5764-4/11 LA7566 AC Characteristics Test Circuit Diagram Test Circuit Input Impedance Test Circuit (VIF and first SIF input impedance) Impedance analyzer No. 5764-5/11 LA7566 Pin Functions Pin No. Symbol Pin function Equivalent circuit * Audio FM detector output. Deemphasis is switched internally in the IC. (5 k and 7.5 k) 1 FM DET OUT This switching is linked to the SIF input switch. An external emitter-follower circuit must be provided if the deemphasis is disabled. 2 SIF FILTER * Connection for a filter that holds the FM detector output DC voltage at a fixed level. Normally, a 1-F electrolytic capacitor is used. To improve the low band (around 50 Hz) frequency characteristics, increase the value of this capacitor (C1). * VIF amplifier input. 5 6 VIF IN The input circuit is constructed as a balanced input, and the input has the following impedance characteristics: R 1.5 k C 3 pF Continued on next page. No. 5764-6/11 LA7566 Continued from preceding page. Pin No. Symbol Pin function Equivalent circuit * IF AGC filter connection. The AGC voltage is created at pin 7 from the signal to which peak detection was applied by the internal AGC detector. Additionally, the IC includes an internal second AGC filter (a lag-lead filter) used to create a dual time constant. A 0.022 F capacitor is used as the external capacitor. The value of this capacitor must be adjusted according to measurement of the sag, AGC speed, and other circuit aspects. 7 IF AGC * First SIF input. A DC cut capacitor must be inserted in the input to this circuit. 8 1st SIF IN When a SAW filter is used: The first SIF sensitivity can be increased by inserting an inductor between the SAW and the IC to match the SAW output and IC input capacitances. When an intercarrier system is used: This pin must be connected to ground through a capacitor. * RF AGC output. 9 RF AGC OUT This output controls the tuner RF AGC. This is an opencollector output with an inserted 100- protective resistor. Determine the value of the external bleeder resistor to match the tuner specifications. * AFT output. The AFT center voltage is created with an external bleeder resistor. The AFT gain increases as the value of this bleeder resistor increases. The value of this resistor must not exceed 390 k. This circuit includes a control function that controls the AFT voltage to be equal to the center voltage in weak field reception conditions. 10 AFT OUT Continued on next page. No. 5764-7/11 LA7566 Continued from preceding page. Pin No. Symbol Pin function Equivalent circuit 11 12 * VCO tank circuit used for video detection. VCO See the separately provided documentation for the tank circuit coil (inductor) specifications. * Equalizer circuit. This circuit corrects the video signal frequency characteristics. * Notes on equalizer amplifier design: The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 2.3 dB. When the frequency characteristics are corrected, connect an inductor, a capacitor, and a resistor in series between pin 14 and ground. The equalizer amplifier gain is given by: R1 AV = ---- + 1 Z Here, R1 is an IC internal resistor with a value of 1 k. Select Z according to the desired characteristics. However, care is required to prevent distortion at the resonant point determined by Z, where the gain is maximum. 13 14 VIDEO OUT EQ FILTER 15 16 PAL VIDEO IN NT VIDEO IN * Equalizer amplifier inputs. Pin 15 is for PAL, and pin 16 for NTSC format signals. These inputs are linked to and switched by the SIF switches. * PLL detector APC filter connection. The APC time constants are switched internally in the IC. When locked, the VCO is controlled over the path A, and the loop gain is reduced. When unlocked and during weak field reception, the VCO is controlled over the path B, thus increasing the loop gain. We recommend values of: R = 150 to 390 , and C = 0.47 F for the loop filter constants. 17 APC FILTER Continued on next page. No. 5764-8/11 LA7566 Continued from preceding page. Pin No. Symbol Pin function Equivalent circuit * Output for the video signal that includes the SIF carrier. 18 COMP OUT A resistor must be inserted between pin 18 and ground to acquire an adequate drive capability. R 470 * First SIF output 19 1st SIF OUT The signal output from this pin is passed through a bandpass filter and input to the SIF circuit. This is an emitter-follower output. * The FM detector signal-to-noise ratio can be improved by inserting a filter in the FM detector bias line. 20 FM FILTER C1 should have a value of 0.47 F or greater, and 1 F is recommended . If the FM detector is not used, pin 20 must be connected to ground through a 2-k resistor. This stops the FM detector VCO circuit. * SIF inputs. Four input pins are provided to support multi-side systems, and a switching function is also included. Since buzzing and bass beating can occur if interference signals, such as the video signal or the chrominance signal, enter these pins, extra care must be taken in designing the input circuit pattern layout. Note that pin 24 also functions as the RF AGC adjustment pin. This pin sets the tuner RF AGC operating point. Also, the FM output and the video output can be muted at the same time by setting this pin to the ground level. 21 22 23 24 SIF IN (4.5 MHz) SIF IN (5.5 MHz) SIF IN (6.0 MHz) SIF IN (6.5 MHz) RF AGC VR A H H H H L L L L Switch B C H H H L L H L L H H L L H L L H 5.5 MHz q 6.0 MHz 6.5 MHz q q 4.5 MHz q q q q q q q q q q q q No. 5764-9/11 LA7566 Notes on Sanyo SAW Filters There are two types of SAW filters, which differ in the piezoelectric substrate material, as follows: 1. Lithium tantalate (LiTaO3) SAW filter TSF11 s s s ****** Japan TSF12 s s s ****** US Although lithium tantalate SAW filters have the low temperature coefficient of -18 ppm/C, they suffer from a large insertion loss. However, it is possible, at the cost of increasing the number of external components required, to minimize this insertion loss by using a matching circuit consisting of coils and other components at the SAW filter output. At the same time as minimizing insertion loss, this technique also allows the frequency characteristics, level, and other aspects to be varied, and thus provides increased circuit design flexibility. Also, since the SAW filter reflected wave level is minimal, the circuit can be designed with a small in-band ripple level. 2. Lithium niobate (LiNbO3) SAW filter TSF52 s s s ****** US TSF53 s s s ****** PAL Although lithium niobate SAW filters have the high temperature coefficient of -72 ppm/C, they feature an insertion loss about 10 dB lower than that of lithium tantalate SAW filters. Accordingly, there is no need for a matching circuit at the SAW filter output. Although the in-band ripple is somewhat larger than with lithium tantalate SAW filters, since they have a low impedance and a small field slew, they are relatively immune to influences from peripheral circuit components and the geometry of the printed circuit board pattern. This allows stable out-of-band trap characteristics to be acquired. Due to the above considerations, lithium tantalate SAW filters are used in applications for the US and Japan that have a high IF frequency, and lithium niobate SAW filters are used in PAL and US applications that have a low IF frequency. Notes on SAW Filter Matching In SAW filter input circuit matching, rather than matching the IF frequency, flatter video band characteristics can be acquired by designing the tuning point to be in the vicinity of the audio carrier rather than near the chrominance carrier. The situation shown in figure on the right makes it easier to acquire flat band characteristics than that in figure on the left. SAW filter characteristics The high-band reduced The high-band is extended Frequency Frequency With the tuning set to the IF frequency Coil Specifications JAPAN f = 58.75 MHz With the tuning set to the vicinity of S and C US f = 45.75 MHz PAL f = 38.9 MHz VCO coils Test production No. 16991A Tokyo Parts Industrial Co., Ltd. Picture SAW filters (split) TSF1137U SOUND SAW filters (inter) Test production No. 16687A Tokyo Parts Industrial Co., Ltd. Picture TSF1241 SOUND TSF5220 Test production No. 16686A Tokyo Parts Industrial Co., Ltd. Picture TSF5315 SOUND TSF5321 TSF5344 TSF5221 Tokyo Parts Industrial Co., Ltd. 236 Hinode Machi Isesaki Shi, Gunma Prefecture Japan TEL: +81-270-23-3731 No. 5764-10/11 LA7566 Notes on VCO Tank Circuits 1. Built-in capacitor VCO tank circuits When the power is turned on, the heat generated by the IC is transmitted through the printed circuit board to the VCO tank circuit. At this point, the VCO coil frame functions as a heat sink and the IC heat is dissipated. As a result, it becomes more difficult to transmit heat to the VCO tank cricuit's built-in capacitor, and the influence of drift at power on is reduced. Therefore, it suffices to design the circuit so that the coil and capacitor thermal characteristics cancel. Ideally, it is better to use a coil with a core material that has low temperature coefficient characteristics. 2. External capacitor VCO tank circuits When an external capacitor is used, heat generated by the IC is transmitted through the printed circuit board directly to the VCO tank circuit external capacitor. While this capacitor is heated relatively early after the power is turned on, the coil is not influenced as much by this heat, and as a result the power-on drift is increased. Accordingly, a coil whose core material has low temperature coefficient characteristics must be used. It is also desirable to use a capacitor with similarly low temperature coefficient characteristics. Note: Applications that use an external capacitor here must use a chip capacitor. If an ordinary capacitor is used, problems such as the oscillator frequency changing with the capacitor orientation may occur. s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of March, 1998. Specifications and information herein are subject to change without notice. PS No. 5764-11/11 This datasheet has been download from: www..com Datasheets for electronics components. |
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